Door lock



Jan. 15, 1952 5. D. DALL DOOR LOCK 4 Sheets-Sheet 1 Filed Dec. 3, 1945 775.77 fur EDWARD D; DALL Jan. 15, 1952 E. D. DAL-L DOOR LOCK 4 Sheets-Sheet 2 Filed Dec. 5, 1945 [fire/7727f EDWARD 1). BALL mww Ma Jan. 15, 1952 DALL 2,582,923

DOOR LOCK Filed Dec. 5, 1945 4 Shegs-Sheet s .[J'Z/VEZ'ZTUF. .EDWARD D DALI.

Jan. 15, 1952 E. D. DALL DOOR LOCK 4 Sheets-Sheet 4 Filed Dec.

Patented Jan. 15, 1952 DOOR LOCK Edward D. Dall, Detroit, Mich., assignor to Houdaille-Hershey Corporation, Detroit, Mich a corporation of Michigan Application December 3, 1945, Serial No. 632,302

20 Claims. 1

This invention relates to a door lock, and more particularly to a door locking structure for use on automobil doors.

In accordance with the principles of this invention, I provide an automobile door locking structure that can be locked from the outside only by means of a key, thereby eliminating any possibility of the car operator locking the car keys inside of the car and being unable to open the door. The arrangement of the locking structure is such that the locking mechanism, if it should be in locked position when the door is open, is automatically shifted to its unlocked position upon the door being closed. Thus, the door canbe locked from the outside only by means of the key after the door has been closed.

On the other hand, the locking structure is such that the door may be unlocked from the inside, even though locked by a key from the outside. The door can also be locked'from the inside either by means of the inside door handle or by means of a button-operated lever. When so locked from the inside, the door can be unlocked from the outside.

In addition to these features, my present invention provides a holding and take-up lever mechanism that, insures the holding of the door closed against vibrating open, once the door has been latched, regardless of the tightness with which the door is closed. Thus, the door itself, and also the locking ,mechanism, is prevented from vibrating open so long as the door is closed sufficiently to latch it, independently of the force used in closing the door or of the cushioning effect of the resilient gasket about the door jamb. My door locking structure is also so arranged that the holding and take-up lever mechanism is automatically released for operation to unlatch the door upon unlocking the door, whether the unlocking be accomplished by means of the key, the inner door handle or the button-operated lever previously referred to.

It is therefore an important object of this invention to provide a door locking structure for automobiles and the like, in which there is provided a holding and take-up lever mechanism operative upon latching the door to hold the door and, lock-1 parts against vibrating open regardless of the degree of tightness with which the door is closed or the effectiveness of the cushioning action of the resilient gasket about the door jamb.

' It is a further important object of this invention to provide a door locking structure of novel and improved construction such that any possibility of the car operator locking the car key inside of the car and thus lockin himself out is eliminated, and also such that if the locking mechanism is already in locked position with the door open, closing of the door automatically shifts the locking mechanism to its unlocked position, whereby the door can b locked from the outside only by means of the key after the door has been closed.

Another object of this invention is to provide a means whereby the pressure required to release the latch remains nearly constant whether the door is closed nearly tight or whether the door is closed very tight.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompanying drawings.

For a better understanding of the drawings, which will be presently described, it may be pointed out that the locking structure is assembled on a base plate formedto provide two plate portions at right angles to each other. The plate portion which is to be ,mounted on the opening edge of the door and which carries the rotor assembly for contacting the striker plate on the door post will hereinafter be called the rotor plate. The other plate portion, which fits into position parallel to the inside wall of the door and on which is mounted the roll-back means, wiill hereinafter be called the roll-back plate.

On the drawings:

Figure l is a side elevational view of a locking structure embodying the principles of my invention, showing the locking mechanism mounted on the roll-back plate with the lock in its latched but unlocked position and also showing, with parts'broken away, the door operating mechanisms actuated, respectively, by the inside door handle and by a button-operated lever, the locking structure illustrated in Figure 1 being adapted for use on a front door of an automobile.

Figure 2 is a side elevational view, partly broken away, of the locking mechanism mounted on the roll-back plate showing the lock in its unlatched, unlocked position.

Figure 3 is a side elevational view, partly broken away, of the locking mechanism mounted on the roll-back plate, showing the lock in its latched and locked position,

Figure 4 is a side elevational view of the locking mechanism mounted on the inside of the rotor plate, showing the rotor lever out of engagement with the cam surface, as is the case when the door is open. 7

Figure 5 is a side elevational view of the look-- ing mechanism mountedon the inside of the rotor plate, showing the rotor lever in full takeup position on the cam surface, as is the case when the door is closed.

Figure 6 is a fragmentary enlarged sectional view taken substantially along the line V'I-VI of Figure 1.

Figure 7 is a fragmentary, sectional view taken substantially along the line VIIVII of Figure 1, in association with an elevational view of the striker plate, or keeper structure, mounted upon the door post, illustrating the position of the rotor and safety-catch arm as the door approaches a closed position.

Figure 8 is a fragmentary, sectional view with the keeper structure in elevation, similar to Figanism mounted on the roll-back plate with the lock in its latched, unlocked position.

Figure 11 is a side elevational'view of'the looking mechanism of Figure mounted on the inside of the rotor plate, showing the rotor lever out of engagement with the cam surface as is the case when the door is open, and showing in dotted lines the position of the rotor lever on the cam surface when the door isv closed.

Figure 12 is a side elevational view similar to that of Figure 10 but showing a door-locking 5*.

mechanism mounted on the roll-back plate with the lock in its latched, locked position.

Figure 13 is a side elevational view of a further modified form of my locking structure, with parts broken away, showing the locking mechanism for a front door mounted upon the rollback plate with the lock in its latched and locked position.

Figure 14 is a side elevational view of the:

portion of the locking mechanism illustrated in Figure 13 that is mounted on the inside of the rotor plate, showing the rotor lever out'of engagement with the cam surface, as is the'case when the door is'open and showing in dotted lines the rotor lever in position on the cam surface when the door is closed.

Figure 15 is a side elevational view, similar to that of Figure 13, showing the locking mechanism in its unlatched and unlocked position.

With reference to Figures 1 to 9, inclusive, the locking mechanism of my invention here shown in one adapted-to be used on either of the front doors of a four-door automobile, or on the rear doors of a four-door automobile, or, in the case of a two-door model, on either one of thetwodoors. As previously stated, the main locking structure is assembled on a base plate formed to provide two plate portions disposed at right angles to each other. Although these plate portions are ordinarily formed from a single base plate by bending the plate, they will be herein referred to as though they were separate plates, one being identified as the rotor plate and the other as the roll-back plate. As shown in Figures l, 2 and 3, the roll-back plate is indicatedby the reference numeral I 0 and comprises a rectangular plate that may suitably be formed of light gauge metal sheets. The roll-back lever II is mounted forpivotal-movement upon the plate Ill, being positioned thereon by the squarespindle I2 of the outside door handle (not shown). A second lever I3 is also mounted upon the spindle I2 and lies on top of the lever II, both of said levers having square apertures for receiving said spindle I2 for turning movement therewith. A spring I4 normally urges the lever I3 against a stop I5. Said spring I4 is anchored at one end in a metal loop I8 (Figs. 1 and 6) secured to the roll-back plate Ill. The spring I4 has a coiled intermediate portion Ma enclosing the loop I8 and is provided with a straight end portion Mb that extends into and is confined by said loop I8. The free end of the spring I4 is bowed, as at Mc-for engagement with a lower edge of the top lever I3.

A lever I6 is mounted upon the roll-back plate In for pivotalmovement about the loop I8. For this purpose, an annular washer Ilia (Fig. 6) is positioned upon said loop I8 between the plate I0 and the spring I4, and the lever l6 pivots about said washer ISa. The lever I6 is provided with a projection ll extending from its upper edge and adapted to cooperate with the roll-back lever II in the operation of the locking mechanism. It should be noted in this connection that the roll-back lever I I may be rotated in a clockwise direction by means of the spindle I2 into contact with the projection ll of the lever I6 (Fig. 2), while counter-clockwise rotation of said roll-back lever I I, as well as of the overlying lever I3, is limited by the stop I5, against which the levers II and I3 are normally held under the action of the spring I4.

A pin I9 is secured in the lever I6 near the lower portion thereof and projects inwardly (as viewed from the inside of the car) into a slot 20a provided in a strap 20. Said strap 23 is connected to the inside handle mechanism, indicated generally by the reference numeral I and to be described later on. Said lever I6 is also provided at its lower end with an inwardly bent-up flange, or edge, 2|. groove 22 is provided in the upper righthand corner of the lever I6, as viewed in Figures 1 to 3, inclusive, which serves as a guide for the travel of a pin 23 projecting inwardly from a rod 65. Said rod 65 extends upwardly through the molding of the door and carries at its upper end a push-button (not shown) to facilitate manual manipulation of the rod in the looking or unlocking operation, details of which will be apparent as the description proceeds. When the lever I6 is rotated in a counterclockwise direction, either by means of the roll-back lever II or by means of the strap 20 acting through the pin I9, the locking mechanism is brought into its unlatched, unlocked position, as illustrated in Figure 2.

A dogging lever 24 is mounted upon said rollback plate Ill. Said dogging lever 24 has an upwardly projecting tongue 24a for cooperation with the downwardly projecting tongue 25 formed on the lever I6. Said dogging lever 24 also has a latching arm 26 which extends through the rotor plate Iill and acts as a safetycatch arm, as well as acting as a means for rotating the dogging lever 24. chored at 28 on the roll back plate ID, has a free end 21a biased against the under side 2412 of the dogging lever 24 to resist any clockwise rotation of said dogging lever 24.

A locking lever 29 is provided with a" square aperture for receiving a square spindle 30, which constitutes the shank of the outside key-operatedlock. A suitable type of. key-operated lock is An arcuate-shaped- A spring: 21, an'

, illustrated in my Patent No. 2,246,781. The con-- struction is such that the locking lever 29 is rotated by the key-operated spindle 39 independently of the dogging lever 24.

Said locking lever 29 has two arms 3| and 32 which provide therebetween a pocket 33 for engagement by the bent-up flange, or edge, 2| of the lever l6, for operating the lever [6 to locking position, as illustrated in Figure 3. When the projection 2| is so engaged between the two arms 3| and 32, the lever l6 may be rotated in a clockwise direction by means of the arm 32, or it may be rotated in a counter-clockwise direction by the action of the arm 3|.

A spring 34, anchored at one end, as at 3411, between the roll-back plate I9 and a cover plate 35, bears at its free end 34b against the lower edge ofthe locking lever 29. Said locking lever 29 is provided with a pair of spaced notches 36 and 31, into which the free spring end 34a is adapted to be selectively moved during rotation of the spindle 39 by means of the outside key lock. Both the dogging lever 24 and the locking lever 29 are held in place against the'roll-back plate |9 by means of the cover plate 35.

Referring now to Figures '1 to 9, inclusive, there is shown a rectangular housing 38 which is mounted upon the outer side of the rotor plate |9| (Figs. 1 to 3). Said housing 36 serves for the mounting therein of a rotor 39, which is of V- or angular shape and is mounted for rocking movement upon a pin 40 journaled at its ends inthe outer wall of said housing 38 and in the rotor plate |9|, respectively. Said rotor 39 has a. locking arm 4| and a setting arm 42. A stud 43 (Fig. 4) projects from the side of the arm 4| through an arcuate slot 44 in the rotor plate I9 I.

As best shown in Figures 4 and 5, a rotor locking lever 45 is fulcrumed upon the end of the stud '43 that projects through the arcuate slot 44. A coiled'spring 46 surrounds and is anchored at one end, as at 46a, to the stud 43, with its free end 46b held against an abutment arm 41 projecting from the lever 45. The inner end 49a of the rotor fulcrum pin 49 provides a stop for engagement by the abutment arm 41 when the stud 43 is at the lower end of'the slot 44, so that the spring 45 cannot then rotate the locking lever 45. However, when the rotor 39 is rocked, the stud 43 carries the locking lever 45 bodily upwardly for release of its abutment arm 41 from the restraining action of the stop 49a so that the spring 46 can then rotate the locking lever 45 about the stud 43 in a counter-clockwise direction to the position shown in Figure 5.

A stud 48 extends inwardly from the rotor plate ||l|' adjacent the outer edge thereof to form a fulcrum support for the outer end of a holding and take-up lever 49. The upper edge of said lever 49 is serrated or provided with a wave-like contour, as at 49a. The rotor locking lever 45 is provided at its upper end with an inwardly projecting tongue 59 having a curved edge 59a adapted to engage the upper edge 49a of the takeup lever 49. Said lever 49 has an arm 5| that is downwardly offset from the upper edge 49a and that extends through a slot 5|a in the rollback plate l9. When the dogging lever 24 is in its dogging position, the end of the arm 5| rests thereon, as illustrated in Figures 1 and 3, upon the horizontal edge 24c to prevent downward movement of said arm 5 I, whereas when the dogging lever 24 is out of its dogging position, as illustrated in Figure 2, the arm 5| is free to drop and thereby effect a disengagement betweenthe tongue 59 and the upper edge 49a of the take up lever 49, whereupon the rotor locking lever is free to move out of engagement with said take-up lever 49.

The operation of the locking mechanism will now be described.

Latching of the door is accomplished in the following manner. Let us assume that the door is open. The relative positions of the elements of the locking mechanism will then be as illustrated in Figure 1. The dogging lever 24 assumes the position there shown due to the counterclockwise torque imposed upon it by the spring 21. On closing the door, the arm 26 of the dogging lever 24 is brought into contact with the keeper structure mounted on the door post.

,As illustrated in Figures '1 to 9, inclusive, the keeper structure K is of U-shape and providesa channel 52, the middle portion of the upper wall of which is deflected downwardly to provide a V- shaped camming projection 53 in the channel. The lower wall of the channel is deflected upwardly to provide a camming projection 54 having a gradually inclined guide surface 55 along its outer end and provided with a shoulder 56 along its inner end in advance of a recess 51.

When the door is swung from open position for closing thereof, the projecting safety-catch arm 26 on the dogging lever 24 will encounter the inclined surface 55, thereby causing the dog ging lever 24 to be rocked in a clockwise direction against the resistance of the spring 21. As closing of the door continues, the arm 26 rides up along the guide surface 55 and along the in-- termediate horizontal portion of the camming surface 54 until it reaches the shoulder 56, whereupon the arm 26 is free to drop and under the positive action of the spring 21 is caused to drop down into the recess 51 (Fig. 9).

The door is now in its latched but unlocked position with the relative positions of the elements of the locking mechanism as shown in Figure 1. From the instant that the safety-catch arm 26 drops down in back of the shoulder 56,

:-' the door will be safety-latched and cannot be opened from this position until the safety-catch arm 26 is swung out of the recess 51 by means of the release action either of the inside or outside door handle.

As the door moves toward latching position, but afterthe safety arm 26 drops into the recess 51, the setting arm 42 of the rotor lever 39 comes into engagement with the inclined outer face 59 of the projection 53' in the keeper channel, as shown in Figure 8. Further closing movement of the door causes the rotor lever 39 to be rocked upon its fulcrum pin 49, thereby swinging the locking arm 4| upwardly for bodily movement of the rotor locking lever 45 (Fig. 4) to bring the locking lever tongue 59 above the edge 49a of the take-up lever 49. At this point, the spring 46 is free to bias the locking lever 45 in a counter-clockwise direction to move the tongue 59 along said upper edge 49a of the takeup'lever .9 into camming engagement therewith. At the same time, the end of the locking arm 4| moves into engagement with the rear inclined surface 69 of the projection 53 on the keeper K until it reaches the position illustrated in Figure 9. In this position, the door is latched and cannot be opened until the rotor lever 39 is free to revolve about its fulcrum pin 49 in a clockwise direction. In the latched position, the rotor lever 39 cannot revolve in a clockwise direction because the tongue 59, which is an integral part assaaaa of the :rotor locking lever 45, is now up on the cam surface 49a of the take-up lever 4,9. The take-up-lever 49, in turn, cannot moveina clockwise direction, or downwardly, because its projecting arm 5| is prevented from moving in a vertical direction by the dogging lever 24, the undersurface of the arm 5| then resting upon a straight edge 24c of said dogging lever 24.

With the locking mechanism in the position illustrated-in Figure 1 and the rotor lever in the position illustrated in Figure 9, the total effect .of the :action of the inclined surface .66 of the keeper against the locking arm 4| is to press the tongue 50 more firmly down upon the surface 49a of the take-up lever 49 whenever a force is exerted against the door-tending to open it, provided-there is no concurrent use of the door handle release means. Such a force, for instance, would be exerted against the door if a person or object were accidently to lean or be thrown against the inside Of the door. At any position that the tonguetc may assume along the surface 49a of the take-up lever 49, it will be held tightly in place by the action of the inclined surface 60 of the keeper against the locking arm 4|. Thus,

while the tongue 50 will move across the surface;

49a only so far as is dictated by the amount of force used in closing the door and by the amount of cushioning material about the doorjamb, said tongue 50 will nevertheless be held in tight engagement with the surface 49a for any position therealong that the tongue 59 may assume. The provision of a serrated, notched or wavy surface 49a, on the take-up'lever llil nullifies the efiect of vibration on the holding qualities of the tongue 50, so that no amount of vibration by itself can loosen the engagement of the tongue 50 with the cam surface 49a-although such vibration may produce a tightening effect due to the continued biasing action .of the spring 46 tending to move the tongue 50 into tighter and tighter engagement-with the surface 49a.

The pressure which the tongue 50 of lever 45 exerts on'the surface 49a of lever '49 acts through a moment arm about the-center of stud 48 and thus causes the armii! f lever 49 to exert a pressure on the dogging lever 24. The tighter the door :is closed, the shorter willbe this moment arm since the tongue 50 will move further up along the surface 4911. However, at the same time the moment arm is being shortened, the pressure of tongue 50 on the surface 49a is being increased due to the tighter closing of the-door, and as-a result ,thepressure of the arm ,of'lever 49 on the dogging lever '24 will remain substantially constant. Therefore the pressure required for-releasing the dogging lever 24 from underarm 5| will remain nearly constant.

Theunlatching and opening of the door will now be described. From the preceding discussion it-is evident that the one way in which the door may be unlatched is to move the dogging lever 24 :from under the arm 5| of the take-up lever 49. This will allow the take-up lever 49 to swing downwardly about the stud 48, permitting the tongue 5|) to slide back down along the surface 49a whenever the surface Bil-exerts a force on the locking arm 4| that tends to rotate said locking arm 4| in a clockwise direction. -'Ihe dogging lever 24 may be withdrawn-from under the arm 5| by either one of two methods.

-In accordance with one of these methods,'the roll-back lever l|maybeyrotated ina clockwise direction --by the outside door handle acting throughthespindle -|2. Theron-back lever H Will Contact the pr jec ion J o the e er .15 t9 cause said lever 1-5 to be rotated in a counter! clockwise direction into a position such as illustrated in Figure 2. The lever -|6 will. in turn, effect contact between the projection 25 on said lever andthe projection 24a on the dogging lever 24, causing the dogging lever 24 to rotate in .a clockwise direction vout from under the arm 5| at the same time raising the safety arm 25 to a point above the level of the shoulder 56 of the keeper. When the locking mechanism is in this position (Fig. 2,) the door can be opened by an outward pull on the handle, outward movement of the door causing the surface 60 of the keeper K to rotate the locking arm 4| in a clockwise direction to permit the door to open.

As the dogging lever 24 is constantly biased byspring Z'l-to project the safety latch arm 26,-when either theoutside orinside door handle is released after retracting the safety latch and dogging lever the inclined edge 24d on the dogging'lever, will raise the end 5| of lever 49 back to itsnormal operative position.

A second method of unlatching the door is. by means of the inside .doorhandle, which will now be described. As illustrated in'Figure 1,-the inside door handle mechanism 10.0 includes an inside door handle 62 extending from a shaft 163. A downwardly extending lever arm 102 is mounted upon .said shaft 63 andatitslower-end is pivotally connected, as at I03 to the-free end of-the strap .20. A spring I04 tends to maintain the shaft 63 and inside door handle 162 in the position indicated in Figureil.

It will be evident that when the inside door handle'62 is rotatedlina counter-clockwisev direction about its fulcrum 63, thestrap 20 will be moved to the right,as viewedin Figure 1. When said strap v2E! has been moved far enough to the right to bring the left hand end of the groove 26a into contact with the pin ;|9, further movement-of the strap 20 will cause the pin l9 to be moved to the right. Since the pin I9 is anintegral part of the lever |6,-said lever will be, rotated in a counter-clockwise direction about its pivot point 18. In the course of its counter-clockwise rotation, the projection .25 on the lever 6 will come into contact with the projection 24a on the dogginglever 24,.causing thelatter to berotated in a clockwise direction and withdrawing the straight edge 240 out from under the arm of the take-up lever :49. -.When this occurs, the door is freeto be pushed open from theinside.

It should'be noted that if the door had'jbeen partially closed with the safety-catch arm 26 lying in the recess 5'! of the keeper K, either-of the above mentioned releasing members will result in the withdrawalof thearm ZB-from said recess 57, since the arm 26 is an integral part of the dogging lever and rotates wheneverthe dogging lever rotates. The unlatched position is shown in Figure 2.

The operation of the locking means will now be described.

The ,doorrmay-be lockedby any one of three methods. ,From the outside, looking may be accomplished by revolving the spindle 30 by means of a key. When 'the'spindle 30-is rotated in a counter-clockwise direction, the locking lever 29 will also be-rotated in a-counter-clockwise direction and the arm 32 will be caused to contact the-bent-up edge 2| of the lever 16.

'The :lever-| -6 will thereupon be-rotated in.a clockwise direction about-the pivot washer Him-thereby moving the projection 11, to :a point wher if the roll-back lever II be rotated it will merely be blocked by said projection IT and will not be able to rotate lever I6 in a latch releasing movement. Thus, the door cannot be unlatched by merely turning the outside door spindle I2, since in this position (Fig. 3) the outside door handle is blocked and thereby rendered inoperative for unlatching the door.

The second method of locking the door is by means of the inside door handle. It will be seen by reference to Figure 1 that if the inside door handle 62 is swung upwardly, that is in clockwise rotation about its fulcrum 63, the strap will be moved to the left. When said strap 20 has been moved far enough to the left to bring the end of the slot 20a into contact with the pin I9, further movement of said strap will cause the pin I9 to be moved to the left. Since said pin is a part of the lever I6, said lever will be revolved in a clockwise direction about its pivot washer I6a until the projection I1 is again in blocking relation to the end of the roll-back lever I I, as illustrated in Figure 3; The inside handle62 will be returned to its neutral position as shown in Figure 1 by the action of the spring I04, at which time the pin I9 will be at the end of the slot 20a of the strap 20 as shown inFigure' 3. The outside door handle on the spindle I2 is thus again rendered inoperative and in this way the door may be locked from the inside against entry from the outside.

The third method ,of locking the door is by means of a locking button (not shown) secured to the upper end of the rod 65. When the rod 65 is moved downwardly under the manual operation of the push button, the pin 23 on the lower end of the rod 65 rides in the slot 22 of the lever I6 until it reaches the lower end of the slot, whereupon further downward movement of the rod 65 will cause the lever I6 to be rotated clockwise about its pivot washer I6a, thereby rotating .the projection I? to a position in blocking relation to the end of the roll-back lever II. The locking mechanism is again in its locked position as illustrated in Figure 3. Elince the spindle 30 and the locking lever 29 are rotated in counter-clockwise rotation or the locking position by the bent-up edge 2i of the lever I6, a movement of the key means in clockwise rotation will turn the spindle 30 and the lever 29 in clockwise rotation and therefore move the lever I6 in counter-clockwise rotation to unlocking position. Therefore, even though the door is locked from the inside by the button or the inside handle means, it can be unlocked again by the key means from the outside.

It should be noted that while the locking of the door from the outside with a key will prevent opening of the door bymeans of the outside door handle, it will not prevent the door from being opened from the inside by means of the inside door handle. Since the strap 2|] acts directly upon the lever I6, the upturned edge 2| of said lever, upon counter-clockwise rotation of said lever, will first contact the arm 32 of the locking lever 29 and then rotate said locking lever 29 out of locking position. At the same time, the counter-clockwise rotation of the lever 56 causes the projection 25 on said lever to contact the projection 26a on the dogging lever 24 to lift the safety catch arm 26 out of latch ing position. Manipulation of the inside door handle, therefore, even though the door is keylocked from the outside, is capable of operating the locking mechanism to bring it to the un- 10 latched, unlocked position illustrated in Figure 2. Tldie door can then be pushed open from the in- Si e.

In addition, if the locking mechanism is placed in its locked position while the door is open, the mechanism will be moved to its unlocked position upon the door being closed, due to the fact that the safety-catch arm 26, upon riding up the inclined surface 55 of the keeper K will cause the dogging lever 24 to be revolved clockwise. As the dogging lever 24 revolves clockwise from its locked position (Fig. 3) the leading edge 66 of the projection 24a on said dogging lever 24 moves against an edge 61 on the lever I6 to cause said lever to rotate in a counter-clockwise direction back to its normal unlocked position. At the same time, the locking lever 29 is rotated in a clockwise direction out of its locked position due to the fact that the bent-up edge 2| of the lever I6 engages the arm 32 of said locking lever 29 to move said arm and locking lever into the position illustrated in Figure 2. In this position, the end 34b of the spring 34 is in the notch 31, thereby holding the locking lever. 29 against vibration. The dogging lever 24 is also held against vibration by reason of the biasing action of the spring 21, the free end 2711 of which acting against the lower edge 24b of said dogging lever urges the projection 24a thereof against the projection 25 of the lever I6.

From the foregoing description, it will be evident that since the only method of locking the door from the outside is by means of the key, no one can lock himself out of the car by slamming the door while the keys are on the inside. Figures 10, 11 and 12, illustrate amodified form of my invention of a locking structure as applied to a rear door of an automobile. As is customary, no key-operated lock is used in connection with the rear door locking mechanism. Otherwise, the principles of operation are similar to those already described in connection with Figures 1 to 9,

inclusive.

As illustrated in Figures 10 to 12, inclusive, the reference numeral III) indicates the roll-back plate and the reference numeral III the rotor plate extending at right angles therefrom. A dogging lever I24 ismounted upon the roll-back plate I III for pivotal movement thereon about the axis of an outside doorspindle H2. For this purpose, the dogging lever I24 is provided with an apertured cylindrical boss that extends rearwardly and fits into a corresponding cylindrical recess or depression in the roll-back plate III], the aperture I24a of said boss being irregular as illustrated in dotted lines in Figure 10 to permit limited rotation of said dogging lever I24 to the extent of about degrees as shown in Fig. 10 while the spindle H2 remains stationary. The dogging lever I24 has an arm I26 that extends through an opening 'in the rotor plate III and that constitutes a safety-catch arm. As in the case of the safety-catch arm 26 previously described, when said safety-catch arm I26 rides up along the inclined cam surface of the keeper K, the dogging lever I24 is caused to rotate in a clockwise direction.

A roll-back lever I I3 is mounted on top of the dogging lever I24 and is movable about the spindle H2 as a fulcrum. Said roll-back lever H3 has a cylindrical boss I'I3a, which extends rearwardly and fits into the cylindrical recess provided by the cylindrical boss previously referred to in the dogging lever I24.- Said boss II3a is provided ll with a square hole I I3!) for receiving the spindle H2. The roll-back lever I I3 may thus be rotated by turning the outside door handle mounted on the spindle II2.

Two springs I2? and I 28 are anchored tothe roll-back plate I I by an anchoring abutment I31. The spring I21 abuts against the lower edge-of the dogging lever I24, biasing said dogging lever toward rotation in a counter-clockwise direction.

The spring l28 bears against the lower edge of the roll-back lever I I3, biasing that lever toward rotation in a counter-clockwise direction.

A locking lever I29 is pivotally mounted upon the roll-back plate IIO by means of a pivot pin .I3I, about which the locking lever is free to rotate. Said locking lever I29 has at its lower end a lateral flange I2I. The roll-back lever H3 at its forward end is provided with a shoulder I36 for engagement with said lateral flange I2I as the locking lever I29 is rotated in a clockwise direction. Said shoulder I36 thus limits the .extent of clockwise rotationof .said locking lever I29, as is illustrated in Figure 12. In its normal position the locking lever I29 is held out of engagement with the roll-back lever .I I3 through the action of a spring II4, one end of which is anchored between the roll-back plate I I0 and the cover plate I35 and the free end II4a of which abuts against a corner edge II5 of said locking lever I29. A pin II 9 extends rearwardly from the locking lever I29 for connection to a strap The strap I is connected to an inside door handle mechanism indicated at M (Fig. 10) Said inside door handle mechanism is of a construction similar to that illustrated in Figure 7 of my Patent No. 2,246,783. Said mechanism M comprises a supporting plate I05 adapted to be secured to the door frameand having secured thereto a cover structure I06. A shaft I63, operated by an inside door handle I62, .is journaled in said plate I05 and cover plate I06. A lever I65 is mounted upon said shaft I63 at its upper endand at its lower end pivotally connected through a pivot pin I66 to the strap I20. A spring I61, anchored at one end by the cover plate I06. has a free end that is normally engaged in a detent notch I69 in the upper edge of the lever I65. Whenthe spring I5! is so engaged in the detent notch I98, the locking mechanism is held in its unengaged position as illustrated in Figure .10. Theupper edge of the lever I65 is also provided with a second detent notch I69, the purposeof which will later appear.

The positioning of the parts of the locking mechanism upon the rotor plate II I is quite similar to that already described in connection with Figures 4 and'5. On the outer side ofsaid rotor plate III is secured a rectangular housing I39 for the rotor I39. Said rotor is identicalin form-and construction with the rotor 39 previously described. The rotor I39 is mounted for rocking movement upon a pin I40 and is provided with a locking arm I 4! and a setting arm I42. A stud I43 extending from the end of the arm MI projects through an arcuate slot I44 in the rotor plate III. A rotor locking lever I45 is fulcrumed upon the stud I43. A coiled spring I45 surrounds the stud I43 and is anchored at one endthereto, the free end being held against an abutment I43 on the rotor locking lever I45.

'The fulcrum pin I40 provides a stop for the counter-clockwise rotation of the locking lever I 4.5 when the stud I43 is at the lower end of the slot I44, but as said stud rides upwardly in 1:2 said slot, the "arm I41 of the locking Llever I 45 also rides up and above the fulcrum 'pin I40 into the position illustrated in dotted lines in Figure 11, in reaching which positionthe spring I46 is free to rotate said lever I45 in a counterclockwise direction and to cause the tongue I formed on the end of said lever toride up over and press against the surface I49a of the take-up lever I49. As in the case of the take-up lever 49 previously described, the take-up lever I49 is pivoted about a pin I48 at its outerend. The other end of said take-up lever I49 is provided with an arm I5I that extends through a slot in the roll-back plate IIO. Said arm end I5I is I prevented from dropping down when it rests side or inside handles are released after unlatching the door.

In the case of the locking mechanism illustrated in Figuers .10 to 12, inclusive, latchingof the door is accomplished in the following manner. Let us assume that the door is open. The locking mechanism will then normally bein the position illustrated in Figure 10. Upon closing the door, the safety-catch arm I26 of the dogging lever I24 comes in contact with the keeper structure, such as the keeper structure K (Figs. 7, 8 and 9), already described. When the door is swung from open position to closed position, the projecting safety-catch arm I26 encounters the inclined surface of the keeper structure, causing the dogging lever I 24 to be rocked in clockwise direction against the resistance of the spring I27. The safety-catch arm I26 rides along the keeper surface 55 until the shoulder 56 is .reached, whereupon the arm I26 under the action of the spring I2! is caused to drop down into the recess 51. The dogging lever I24 is thereby allowed to swing back into its normal position and if the movement of the door toward closing position is stopped at this point, the door will then be safety-latched and cannot be opened until the safety-catch arm I26 is swung out of the recess 51 by means of the release action either of the inside door handle I62 or the outside door handle acting through the .spindle I I2.

During the closing of the door, the setting arm I42 of the rotor I39 comes into engagement with the inclined outer face 59 of the projection 53 in the keeper channel. As the rotor I39 is rocked on its fulcrum pin I40, the locking arm I M of the rotor swings upwardly causing the rotor locking lever I45 to move bodily along the slot I 44. Such movement brings the locking lever tongue I50 above the surface I49a of the take-up lever I49, whereupon the spring I 45 urges said tongue I50 along said surface for engagement therewith. At the same time, the end of the locking arm I4I moves into engagement with the rear inclined surface 60 of the projection 53 in the keeper channel as the door reaches its closed position. In this position, the door is latched but not locked, the locking mechanism being in the position illustrated in Figure .10. The door can be unlatchedby turning the outside handle to rotate the spindle H2 and effect clockwise rotation of the dogging lever I 24 out from under the arm I5I to lift the safety-catch arm I20 out of the recess 51in the keeper. As soon as the dogging lever I24 has been rotated out of supporting position with respect to the arm I 5|, said arm is free to drop and release the tongue I50 from its engagement with the surface I49a, thereby also permitting the rotor I39 to rock as the door is opened.

The door may also be unlatched by operation of the inside handle I62. As will be seen from an inspection of Figure 10, when the inside door handle I62 is rotated in a counter-clockwise direction, that is, in a downward direction to the position indicated in Figure 10, the strap I20 is pulled toward the right and, acting through the pin H9, will rotate the locking lever I29 in a counter-clockwise direction about its pivot pin I3I, thus causing the arm I25 of said locking lever to contact the arm I24b of said dogging lever and rotate said dogging lever from under the arm I5I. The clockwise rotation of the dogging lever I24 elevates the safety-catch arm I26 out of the recess 51 of the keeper structure to unlatch the door. inside door handle I62 is rotated in a counterclockwise direction from the position shown in Figure 10, the spring I 61 leaves the indent I68 and rides on the smooth surface I10, so that there will then be no resistance to the action of the spring I21 in returning the dogging lever I 24 to its normal position.

If the door should be partly closed with the safety-catch arm I26 in the recess 51 of the keeper structure, either of the above mentioned releasing methods will withdraw the safety-catch arm I26 from said recess, since the arm is part of the dogging lever I24 and will rotate with the dogging lever.

Since the locking mechanism illustrated in Figures 10 to 12, inclusive, is intended for installation on the rear door of an automobile, no keyoperated locking means is necessary. The means provided for locking is the inside door handle I62 and its connection to the locking lever I29.

As illustrated in Figure 10, when the inside door handle from being operated for unlatching the door. When the inside door handle I62 is rotated in a clockwise direction, the spring I51 will leave the indent I68 and drop into the indent 169 at the point where the upturned edge I2! of the locking lever I29 is in its locking position. Said spring I61 will then hold the locking lever I29 in this position. This, then is a method for locking the door from the inside to prevent unlatching and entry from the outside.

It has been pointed out heretofore that the door latch shown in Figs. 10 to 12 is suitable-for a door not required to have a key controlled lock. This latch, therefore, is lockable only by operation of the inside handle. However, if the inside handle be rotated to door locking position while the :door is open the slamming of the door will restore this latch mechanism to unlockedcondidition. It is obvious that as the door is being slammed the safety arm I26 of the dogging lever will be retracted by the keeper and during this 5 movement the arm I24b of the dogging lever .will press against the edge I29b of lever I29 and rotate the latter out of locking engagement with the outside roll back lever H3. The aperture 124a permits this action.

It will be noted that when the The modification of my locking structure illustrated in Figures 13 to 15, inclusive, is intended for use on the front door of an automobile. As there disclosed, the structure includes a roll-back plate 2 I0 and a rotor plate 2I I. A dogging lever 224 is mounted upon said roll-back plate 2 I0 for pivotal movement thereon about the axis of a spindle 2I2 of an outside door handle (not shown). The dogging lever 224 has a pin 2I3 which extends rearwardly through a slot 2I4 in the roll-back plate 2I0. Said dogging lever is also provided with an arm 226 extending through an opening in the rotor plate 2H and constituting a safety-catch arm like the arms 26 and I25 previously described. A spring 221 bears against an edge of said dogging lever 224 biasing said lever toward rotation in a counter-clockwise direction.

A roll-back lever 2I5 is mounted on top of the dogging lever 224 and has a square aperture engaged by the shank 2I2 for turning movement therewith. The dogging lever 224 and roll-back lever 2 I5 are so mounted as to be rotatable independently of each other, the dogging lever being apertured to be rotatable independently of the shank. A spring 228, mounted on top of the spring 221, has a free end abutting the roll-back lever 2 I5 tending to bias said lever toward rotation in a counter-clockwise direction, and said roll-back lever 2I5 has an arm 2I5a that is adapted to contact the pin 2I3 secured in said dogging lever 224.

The roll back lever 2I5 is provided with a cylindrical base 2I5b which extends inwardly into a corresponding cylindrical boss formed in the dogging lever, the latter boss extending into acircular aperture in roll back plate 2I0, thus coaxially pivoting both levers in the roll back plate, these bosses being similar to those provided in levers H3 and I24 in Fig. 10, and the boss 2 I1 provided in lever 2 I6.

A locking lever 2I6 is mounted at the lower end of the roll-back plate 2I0 and for this purpose is provided with a cylindrical boss 2 I1 that ,7 extends rearwardly and fits into a cylindrical recess in the roll-back plate to permit pivotal movement therebetween. Said boss 2I1 is provided with a square hole for receiving the spindle 2 I8 of the outside key-operated lock. Thus, the locking lever 2I6 may be rotated in a clockwise or counter-clockwise direction by operation of the key-actuated spindle 2I8.

The locking lever 2I6 is provided with an arm 2 I9 having a lateral flange 220 for receiving the lower end of a push-rod 22I. Said push-rod 22I extends upwardly through the window molding to a push-button (not shown). A spring 222, anchored at one end in the cover plate 223, has a free end that abuts against either one of the inclined lever surfaces 229 or 230 formed along the lower edge of the locking lever 2I6. Spring 222 thus holds the locking lever 2i 6 in whichever of the two positions is chosen by turning the key-actuated spindle 2 I8.

The locking lever 2 I6 is provided with an arm 225 which is positioned for contact by arm 233 of the dogging lever 224 when this latter lever is rotated in a clockwise direction, when the parts are in the position shown in Figure 13.

The locking lever 2 I6 also has an arm 225 having a lateral flange 23I that is adapted in locking position to abut against the end of an arm 233 provided on the roll-back lever 2I5.

Referring now to Figure 14, it will be noted that the locking mechanism mounted upon the 'trated in Figures 4, and 11.

rotor plate 2 is .in general similar to that illus- A rectangularly shaped housing 238 is mounted on the outer side of said rotor plate 2 to provide a housing for the rotor 239. Said rotor is of the same vor angle-shape as the rotor 39 previously described. The rotor 239 is mounted for rocking movement on a pin 240 which is secured at its end in the outer wall of the housing 238 and in the rotor plate 2| I, respectively. The rotor has a locking 1:

arm 24! and a setting arm 242. A stud 243 extends from the arm 24| through an arcuate slot 244 in the rotor plate 2| I. A rotor locking lever 245 is fulcrumed on the stud 243. A coiled spring .246 surrounds the stud 243 and is anchored at one end thereto, the other end being held against an abutment arm 241 on the rotor locking lever 245. The inner end of the fulcrum pin 249 provides a stop against which the abutment arm 24! is urged when the stud 243 is at the lower end of the slot 244, so that the spring 243 can- :not then rotate the locking lever 245. However,

when the rotor 239 is rocked, the stud 243 carried the locking lever 245 bodily upwardl; for release of the abutment arm 24'! from the restraining action of the pin 249, and the spring can then rotate the locking lever 245 on the stud 243 in a counter-clockwise direction.

A stud 248 extends inwardly from the rotor plate 2 and provides a pivot or fulcrum support for the outer end of a holding and take-up lever 249. Said lever 249 is provided with an upper surface 249a of wavy contour for engagement by a tongue 250 formed on the upper end of the rotor locking lever 245. Said take-up lever I 249 is also provided with an arm 25| that extends through a slot in the roll-back plate 2 i9. Said arm 25I is held against downward movement by the dogging lever 224 when said lever is in its dogging position and may be restored to the position shown in Fig. 13, after a door unlatching operation, by the inclined edge 224a, as the spring 22'! returns the dogging lever to its normal position.

In the locking mechanism illustrated in Figures 13 to 15, inclusive, latching of the door is accomplished in the following manner. Let us assume that the door is open. The locking mechanism will then normally be in the position illustrated in Figure 13. Upon closing the door,

swung from open position to closed position, the

projecting safety-catch arm 226 encounters the inclined surface 55 of the keeper structure, causing the dogging lever 224 to be rocked in a clockwise direction against the resistance of the spring 221. The safety-catch arm'226 rides upon the projection 55 until the shoulder 56 is reached, whereupon the arm 226 under the action of the spring 221, is caused to drop down into the recess 51. The dogging lever 224 is thereby allowed to swing back into its normal position, and if the movement of the door toward closing position is stopped at this point, the door will then be safety-latched and cannot be opened untli the safety-catch arm 226 is swung out of the recess 51 by means of the release action either of the inside door handle (not shown) or the outside door handle acting through the spindle 2| 2.

During the closing of the door, the setting arm .242 of the rotor 239 comes into engagement with the inclined 'outer'face 59 of the projection 53 in the keeper channel. As the rotor 239 is rocked on its fulcrum pin 240, the locking arm 24l of the rotor swings upwardly, causing the rotor locking lever 245 to move bodily along the slot 244. Such movement brings the locking lever tongue 258 above the surface 249a of the take-up lever 249, whereupon the spring 246 urges said tongue 259 along said surface for engagement therewith. At the same time, the end of the locking arm 24I moves into engagement with the rear inclined surface 60 of the projection 53 in the keeper channel as the door reaches its closed position. In this position, the door is latched but not locked, the locking mechanism being in the position illustrated in Figure 13. The door can be unlatched by turning the outside handle to rotate the spindle 2 i 2 and lever 2 l5 whose arm '2 l 5a will contact pin 2|3 to eiTect clockwise rotation of the dogging lever 224 out from under the arm 25l and to lift the safety-catch arm 226 out 01' the recess 51' in the keeper. As soon as the dog'- ging lever 224 has been rotated out of supporting position with respect'to the arm 25L said arm and lever 249 will drop and release the tongue 25!! from its engagement with the surface 249a, thereby also permitting the rotor 239 to rock as the door is opened.

The door may also be unlatched by operation of the inside handle (not shown) connected to a strap 26D, and the pin 2 l3 which is guided at one end in a slot 269a in the strap 260 and is anchored at the other end in the dogging lever 224. A $101; 214 is provided in the roll-back plate 2| 0 to allow the pin to rotate with the dogging lever. 'As the strap 269 is moved to the right, the dogging lever 224 is rotated in a clockwise direction out from under the arm 25l and the safety-catch arm!" is lifted out of recess 5! or the keeper structure.

From the preceding description, it will be evident that the one way to unlatch the door is 'to move the dogging lever 224 out from under the arm 25l of the take-up lever 249. This will allow the take-up lever to swing downwardly about the stud 248, permitting the tongue 250 to slide back down along the surface 249a whenever the sur face 60 of the keeper exerts a force on the locking arm 24! tending to rotate it in a clockwise direction.

Figure 13 shows the'locking lever 2l6 in locking position, with the lateral flange 23! directly underneath the lower edge of the arm 233 of the roll-back lever 2| 5. Rotation of said roll-back lever 2 I 5 is thereby prevented. The locking lever 216 may be put in its locking position, as illustrated in Figure 13, either from the outside or from the inside. When the outside key is turned in a clockwise direction, the spindle 2 l8 will cause the locking lever arm lip 23| to rotate into position directly beneath and in contact with the lower end of the arm 233 of the dogging lever. From the inside, the door may be'locked by pushing down on the push-button (not shown) to cause downward movement of the rod 22!, thus causing the arm 225 of the locking lever 2I6 to rotate in a clockwise direction from the position shown in Figure 15 and to assume the locking position shown in Figure 13.

It is to be noted that while looking the door from the outside with a key will prevent opening of the door by 'means of the outside door handle, it will not prevent opening by the use of the inside door handle. When the doggingplate' is rotated in-a clockwise direction by the action of the strap 260 on the pin 2 I3, the arm 233 of the dogging lever will contact the arm 225 of the locking lever 2I6 and rotate the latter out of its locking position. Also, if the locking lever 2| 6 is in locking position when the door is open, it will be moved to its unlocked position when the door is closed due to the safety-catch arm 226 riding up the inclined surface 55 of the keeper and causing the arm 233 of the dogging lever 224 to be rotated in a clockwise direction, thus removing the locking lever 2 it from its locking position.

Consequently, since the only method of locking the door from the outside is by means of the key, one cannot lock himself out of the car by slamming the door when the keys are on the inside.

It will, of course, be understood that various details of construction may be varied through a; wide range without departing from the principles of this invention and it is, therefore, not the purpose to limit the patent granted hereon otherwise than necessitated by the scope of the appended claims.

I claim as my invention:

1. A door locking mechanism comprising a rotor plate for mounting on the edge of a door, a rotor pivotally mounted on the outside of said plate and having a setting arm and a locking arm, said locking arm being movable into latching engagement with a keeper upon the closing of said door, a holding and take-up lever having an upper holding surface, means pivotally mounting one end of said lever on the inside of said plate, means for locking the free end of said lever in raised position when the door is latched, said plate having an arcuate slot extendingupwardly from a point adjacent said locking arm toward said pivotal mounting means, a pin secured to said locking arm extendin through said slot for movement therein, a locking lever pivotally mounted on the extended end of said pin and having a member for engagement with said surface, and a coiled spring anchored in said extended pin and urging movement of said member into contact with and along said surface, said spring being effective to cause tight frictional engagement between said member and surface when said locking arm moves into engagement with the back surface of said latch detent. V

2. A door locking mechanism comprisng a rotor plate for mounting on the edge of a door, a rotor pivotally mounted on the outside of said plate and having a setting arm and a locking arm, said locking arm being movable into latching engagement with a keeper upon the closing of said door, a holding and take-up lever having an upper holding surface, means pivotally mounting one end of said lever on the inside of said plate, releasable means for retaining the free end of said lever in raised position when the door is latched, said plate having an arcuate slot extending upwardly from a point adjacent said locking arm toward said pivotal mounting means, a pinsecured to said rotor locking arm extending through said slot for movement'therein, a lock- 7 ing lever pivotally mounted on the extended end of said pin and having a tongue for engagement with said holding surface, a coiled spring ansaid tongue and holding surface when said looking arm moves intolengagement with .thewback' surface of said latch detent, the relative positioning, shape and arrangement of the rotor, the locking arm and said take up lever being such that said frictional engagement increases in intensity as said tongue moves over said 'wavy holding surface under the influence of said spring as the door is moved into a more tightly closed position and further being such that upon the release of said retaining means and the consequent dropping of said free end of said holding and take-up lever said limiting means is effective to disengage itself from said holding surface during opening movement of said door.

3. A door locking mechanism comprising a rotor plate for mounting on the edge of a door, a rotor pivotally mounted on the outside of said plate and having a settin arm and a locking arm, said locking arm being movable into latch-.

ing engagement with a keeper upon the closing of said door, a holding and take-up lever having an upper holding surface, means pivotally mounting one end of said lever on the inside of said plate, means for retaining the free end of said lever in raised position when the door is latched, said plate having an arcuate slot extending upwardly from a point adjacent said locking arm toward said pivotal mounting means, a. pin secured to said locking arm extending through said slot for movement therein, a locking lever pivotally mounted on the extended end of said pin and having means for engagement with said holding surface, said locking lever having an abutment adjoining said pin and a coiled spring anchored at one end in said extended pin end and having a free end in contact with said abutment urging pivotal movement of said locking lever means into contact with and along said holding surface, said spring being effective to cause tight frictional engagement between said lockin lever means and holding surface when said locking arm moves into engagement with the back surface of said latch detent.

4. A door locking mechanism comprising a rotor movable into latchin position by engagement with a keeper, a movable holding and take-up lever, means including a dogging lever operable to retain said holding and take-up lever in one position when said rotor is in latching engagement with said keeper and to release said holding and take-up lever to move into another position to release the rotor for unlatching movement, and a locking lever movable with said rotor into engagement with said holding and take-up lever to hold said rotor in latching engagement with said keeper when said door is closed, said dogging lever having an extended portion for engaging said keeper as the door approaches closed position to move said dogging lever out of retaining position with respect to said holdin and take-up lever.

5. A door locking mechanism comprising, a rocker elementrockable into latching position by engagement with a keeper, a take-up lever pivotally mounted at one end, releasable means for holding the free end of said lever against movement, a locking lever pivotally mounted on said rocker element for engagement with said take-up lever to restrain unlatching movement of said rocker element, means for moving said locking lever from the free end of said take-up lever toward the pivot point of said take-up lever as said rocker element rocks into successive latching positions in said keeper.

6. A look mechanism comprising, a rotor plate for mounting on the edge of a door, a rotor movable into latching engagement with a keeper, a

19 holding and take-up lever pivotally mounted on said rotor plate and having a free end, a rotor lockinglever mounted on said rotor and having a-tong-ue for engagment with said holding and take-uplever, a dogging lever for holding the free end of said holding and take-up lever against movement when said rotor and said keeper are in latching engagement, a roll-back plate for mount ingon the inside wall of a door, outside door handle means including a rotatable release member, said member being operative on said dogging lever for releasing the free end of said holding and take-up lever for movement thereof, and a lockinglever movable into locking position for engagement by said member whereby said outside door handle means is made ineffective for gagement with said holding surface, a roll-back plate for mounting on the inside wall of a door, a dogging lever pivotally mounted on said rollback plate for holding the free end of said holding lever in its holding position when said latching means and said keeper are in latching engagement, outside door handle means operative on said dogging lever for releasing the free end of said holding and take-up lever for downward motion thereof, and a locking lever movable into engagement with said outside door handle means whereby said outside door handle means is made ineffective to operate on said dogging lever for releasing the free end of said holding and take-up lever.

8. A door lock mechanism comprising a rot-or plate, a rotor movable into latching engagement with a keeper, a holding and take-up lever pivotally mounted at one end on said rotor plate, a rotor locking lever mounted at one end on said rotor and having the other end movable into engagement with said holding and take-up lever, a dogging lever for retaining the free end of said holding and take-up lever in operative position for engagement by said rotor locking lever, a

roll-back plate for mounting on th inside wall of a door, a lever pivotally mounted on said rollback plate movable into engagement with said dogging lever for effecting the release of the free endof said holding and take-up lever, and spring actuated means for returning said dogging lever into; position for retaining the free end of said holding and take-up lever.

9. A door lock mechanism comprising a rotor plate, a rotor movable into latching position by engagement with a keeper, a holding and take-up lever pivotally mounted on said rotor plate and having a holding surface, a rotor locking lever pivoted on said rotor and having a tongue for engagement with the holding surface of said holding and take-up lever, dogging means for locking said holding and take-up lever in one position when the door is latched, an inside door handle mechanism, a roll-back plate for mounting on the inside Wall of a door, and a lever pivotally mounted on said roll-back plate and pivotally. connected to said inside door handle mechanism, said lever being movable into engagement with said dogging means for efiectingthe releaseof said holding and take-up lever, whereby the tongue of said rotor locking lever is, allowed to be disengaged from the holding surface of said dogging lever cooperating in one position with said holding and take-up lever to hold said rotor locking lever in rotor latching position, an outside handle operated roll-back lever operable to retract said safety-catch arm and to move said dogging lever out of said cooperating position and door.

means for rendering said roll-back lever inoperative'to move said dogging lever out of said coopcrating position and thus effectively lock said 11. In a door latch mechanism, a rotary bolt engageable with a keeper to hold a door fully closed, a retractable lever having a safety bolt portion engageable with the keeper to hold the dOOr partially closed and movable independently of the rotary bolt, means retained by the lever when the safety bolt is in its projected position for retaining the rotary .bolt in door holding position, and manually controlled means for rendering said lever ineffective to so retain said rotary bolt.

12. In a door latch mechanism, a rotary bolt engageable with a keeper to hold a door fully closed, a retractable lever having a safety bolt portion engageable with the keeper to hold the door partially closed and movable independently of the rotary bolt, means retained by the lever when the safety belt is in its projected position for retaining the rotary bolt in door holding position, and manually operable retracting means operatively connected for retracting the safety bolt to thereby release the rotary bolt.

13. In a door locking mechanism, a rotary bolt having a latching arm rotatable into latching engagement with the keeper, 2. bolt locking lever pivotally supported on said bolt, a take-up member having a holding surface facing away from the pivotal connection of said lever and bolt, and means on said lever engageable with said surface whereby unlatching rotation of the bolt is opposed and prevented by thrust of the locking lever means against said surface in the direction of said pivotal connection.

14. In a door locking mechanism, a rotary bolt having a latching arm rotatable into latching engagement with a keeper, 9. bolt locking lever pivotally supported on said bolt, a take-up member having a holding surface facing away from the pivotal connection of said lever and bolt, means on said lever engageable with saidsurface whereby unlatching rotation of the bolt is op posed and prevented by thrust of the locking lever means against said surface in the direction. of said pivotal connection, and means acting on said lever during latching rotation of the bolt for advancing said lever means along said sur- :face.

15. In a door locking mechanism, a rotary bolt having a latching arm rotatable into lacthing engagement with a keeper, a bolt locking lever pivotally supported on said bolt, a take-up memher having a holding surface facing away from the pivotal connection of said lever and bolt. means on. said lever engageable with said surface whereby unlatching rotation of the bolt is opposed and prevented by thrust of the locking lever means against said surface in the direction of said pivotal connection, and resilient means acting on said lever during latching rotation of the bolt for advancing said lever means along said surface.

16. In a door locking mechanism, a rotary bolt having a latching arm rotatable into latching engagement with a keeper, a bolt locking lever pivotally supported on said bolt, a take-up member having a holding surface facing away from the pivotal connection of said lever and bolt, means on said lever engageable with said surface whereby unlatching rotation of the bolt is opposed and prevented by thrust of the locking lever means against said surface in the direction of said pivotal connection, said take-up member being shiftably mounted, and releasable means retaining said member against shifting when they bolt is in latched position.

17. In a door locking mechanism, a rotary bolt having a latching arm rotatable into latching engagement with a keeper, a bolt locking lever pivotally supported on said bolt, a take-up member having a holding surface facing away from the pivotal connection of said lever and bolt. means on said lever engageable with said surface whereby unlatching rotation of the bolt is opposed and prevented by thrust of the locking lever means against said surface in the direction of said pivotal connection, said take-up member a bein shiftably mounted for shifting movement toward said pivotal connection, and releasable means retaining said member against shifting when the bolt is in latched position.

18. A door locking mechanism comprising a rockable latch bolt movable into latching position by engagement with a keeper, a movable holding and take-up lever, shifftable means movable into one position to support said take-up member and into another position to release said take-up member, a locking lever pivotally mounted on said latch bolt on one side of said holding and take-up lever and extending to the opposite side of said holding and take-up lever for engagement therewith, and a torsion spring connected between said latch bolt and said locking lever and urging said locking lever to pivot toward said latch bolt in a direction to engage said holding and take-up lever and hold said latch bolt in a door locking position and in engagement with the keeper.

19. A door locking mechanism comprising a rotor having a pivot and a setting arm and a locking arm extending to opposite sides of said pivot, a holding and take-up lever pivotally mounted at one of its ends above said rotor and provided with an upper holding surface, means holding the free end of said holding and take-up lever into a holding position and for releasing said holding and take-up member to move downwardly into position to release the latch, a locking lever pivotally mounted on said locking arm on one side of said pivot and having a tongue extending over and into position to engage said holding surface, and resilient means connected between said rotor and locking lever and operative upon said locking lever to move said tongue toward said pivot and into contact with said holding surface upon engagement of said setting arm with the keeper.

20. In a door locking mechanism, a rotor having a locking arm rotatable into latching engagement with a keeper, a take-up member pivoted adjacent one of its ends and extending in a plane parallel to the plane of rotation of said rotor and having a holding surface along the edge thereof opposite from said rotor, a rotor locking lever pivotally connected with said rotor to one side of said take-up member and having a tongue lapping said take-up member and extending to the opposite side of said take-up member into position to engage said holding surface, a dogging lever shiftable into one position to engage and support the free end of said take-up member and hold said take-up member from pivotal movement and into another position to release said take-up member, resilient means connected between said rotor and locking lever and urging said tongue to move toward said rotor and pull against said holding surface, and means adapted to releasably move said dogging lever out of supporting engagement with said take-up member to release said tongue therefrom and permit unlatching movement of the rotor.

EDWARD D. DALL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 738,100 Cuntz Sept. 1, 1903 2,094,413 Schonitzer Sept. 28, 1937 2,231,075 Lakin Feb. 11, 1941 2,246,782 Dall June 24, 1941 2,246,785 Dall June 24, 1941 2,246,787 Dall June 24, 1941 2,301,221 Marple Nov. 10, 1942 2,301,559 Marple Nov. 10, 1942 2,362,256 Endter Nov. 7, 1944 

